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Dir : ~/usr/share/doc/gawk/examples/prog/

Edit File: wc.awk

# wc.awk --- count lines, words, characters, bytes
#
# Arnold Robbins, arnold@skeeve.com, Public Domain
# May 1993
# Revised September 2020

# Options:
#    -l    only count lines
#    -w    only count words
#    -c    only count bytes
#    -m    only count characters
#
# Default is to count lines, words, bytes
#
# Requires getopt() and file transition library functions
# Requires mbs extension from gawkextlib

@load "mbs"

BEGIN {
    # let getopt() print a message about
    # invalid options. we ignore them
    while ((c = getopt(ARGC, ARGV, "lwcm")) != -1) {
        if (c == "l")
            do_lines = 1
        else if (c == "w")
            do_words = 1
        else if (c == "c")
            do_bytes = 1
        else if (c == "m")
            do_chars = 1
    }
    for (i = 1; i < Optind; i++)
        ARGV[i] = ""

# if no options, do lines, words, bytes
    if (! do_lines && ! do_words && ! do_chars && ! do_bytes)
        do_lines = do_words = do_bytes = 1

print_total = (ARGC - i > 1)
}
function beginfile(file)
{
    lines = words = chars = bytes = 0
    fname = FILENAME
}
function endfile(file)
{
    tlines += lines
    twords += words
    tchars += chars
    tbytes += bytes
    if (do_lines)
        printf "\t%d", lines
    if (do_words)
        printf "\t%d", words
    if (do_chars)
        printf "\t%d", chars
    if (do_bytes)
        printf "\t%d", bytes
    printf "\t%s\n", fname
}
# do per line
{
    chars += length($0) + 1    # get newline
    bytes += mbs_length($0) + 1
    lines++
    words += NF
}
END {
    if (print_total) {
        if (do_lines)
            printf "\t%d", tlines
        if (do_words)
            printf "\t%d", twords
        if (do_chars)
            printf "\t%d", tchars
        if (do_bytes)
            printf "\t%d", tbytes
        print "\ttotal"
    }
}